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World’s First Double Diamond Found In Russia

Russian miners found a rare Matryoshka diamond that may be over 800 million years old. The rare “double diamond” resembles a traditional Russian Matryoshka doll, with the stone composed of a diamond within a diamond. The stone was mined at Nyurba mining and processing division of ALROSA in Yakutia and scientists and experts claimed the discovery as the first “diamond within a diamond” unearthed in the history of global diamond mining, as Geek.com detailed:

Yakutsk Diamond Trade Enterprise found this mysterious diamond during a sorting process and they turned it in to the Research and Development Geological Enterprise of ALROSA, where it was studied with several methods, including  X-ray microtomography, Raman, and infrared spectroscopies. Scientists hypothesized that there was an internal diamond at first and the external one developed during the stages of growth.
“The most interesting thing for us was to find out how the air space between the inner and outer diamonds was formed. We have two main hypotheses. According to the first version, a mantle mineral captured a diamond during its growth, and later it was dissolved in the Earth’s surface,” said Oleg Kovalchuk, deputy director for innovations at ALROSA’s Research and Development Geological Enterprise. “According to the second version, a layer of porous polycrystalline diamond substance was formed inside the diamond because of ultra-fast growth, and more aggressive mantle processes subsequently dissolved it. Due to the presence of the dissolved zone, one diamond began to move freely inside another on the principle of [the] Matryoshka nesting doll.”

image credit: Research and Development Geological Enterprise of ALROSA via Geek.com


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Please. It is not "800-million-years-old", it is 800 million years old. It is an 800-million-year-old diamond. In English, dashes are used when phrases (often adjective-noun ones) become an adjective. So the space shuttle uses space-shuttle fuel, for instance.
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